Documents / Official release
This is a Secret History Staff monograph by Gregory W. Pedlow and Donald E. Welzenbach of the Central Intelligence Agency, published in 1992. It gives a history of the CIA's manned overhead reconnaissance program from 1954 to 1974, covering the development and operation of the U-2 and the A-12 OXCART aircraft. It covers overflights of the Soviet Union, the 1960 downing of Francis Gary Powers, and later operations. One section is titled "U-2s, UFOs, and Operation BLUE BOOK."
From the source:Release of 2026-06-12 This CIA History Staff document chronicles the complete history of the U-2 and OXCART (A-12) high-altitude reconnaissance aircraft programs from 1954 to 1974, detailing their development, operations over the Soviet Union and other targets worldwide, the famous downing of Francis Gary Powers in 1960, organizational reforms following that incident, and the eventual transfer of operations from CIA to Air Force control. A more redacted version of this document has been available on CIA's public website.
“Hill”15 pages
336 eeeret PmFOAN Appendix C --Seeret unit was manufactured by the Granger Company. One of these de vices was aboard Gary Powers' U-2 when he was shot down. System-X was a modification of the HRB's System-VII that was specially built in 1962 for a mission over the Soviet Union that never took place. Systems-XI through XV were ECM devices used by U-2s overflying China and North Vietnam during the Vietnam war. System-XVI was a passive ELINT collector. System-XVII was built by HRB-Singer as a result of an October l 963 USIB requirement for the collection of antiballistic-missile (ABM) data from Saryshagan. The system was to be deployed in a U-2 that would fly over western China, along the Sino-Soviet border, collecting data on the ABMs being tested at Saryshagan. By the time the unit was completed in l 965, however, the tipoff time before test launches had been reduced from almost 24 hours to less than an hour, making it impossible to stage U-2 missions in time to collect the data. In the late l 960s, additional ECM systems were needed to coun ter the increasing threats posed by more accurate SAMs and higher flying aircraft. System-XX was specifically designed to counter the acquisition and guidance radars used by MIG aircraft, and System-XXII was an infrared jammer to counter air-to-air missiles. System-XXI, a COMINT package that replaced the much older System-III, was originally developed for the OXCART program and was later adapted for use aboard the follow-on U-2, the U-2R.
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Official release, from the pursue collection. The PDF is mirrored here; the original link is above. 406 pages are in the text index: search them above, or from the library's search.